The 787 FCOM provides the "Relight" procedure.
Boeing follows a standardized document structure across its fleet to aid pilot type-rating transfer. The 787 FCOM is divided into numbered sections, typically aligned with the Air Transport Association (ATA) chapters.
This is the "how it works" section. For the 787, pay attention to these unique chapters:
The 787 FCOM emphasizes that the aircraft runs on AC power. There is no large DC starter/generator. The VFSGs produce variable frequency (360 Hz to 800 Hz) AC.